Trion Worlds are releasing the Castithan Charge Pack for their MMO, Defiance. Paying players can pick up the content on PS3, Xbox 360 and PC on August 20 ($9.99 or 800 MS Points - no UK price mentioned yet), and will be able to play as the alien Castithan species (by either creating a new character or changing their old one).
Those who purchase will also get a new Battle Arena game mode (think horde mode), a new version of the Raptor vehicle, an outfit, and new achievements and trophies. Those who don't pay will still get new weapons, sieges, the Monolith Major Arkfall event, a Duels game mode, and new in-game challenges.